Apps
Free online car tools and calculators for DIY mechanics and owners. Fuel cost, engine, tire, maintenance, diagnostics, and conversion apps — instant, no signup.
Fuel Economy Converter – MPG ⇄ L/100km ⇄ km/L
Fuel Economy Converter Convert any fuel economy figure between L/100km, MPG US, MPG UK, and km/L in one click. Fuel Economy Converter MPG ⇄ L/100km....
Fuel Savings Calculator – Compare Two Cars
Fuel Savings Calculator Compare the annual fuel bill of two cars side-by-side — instantly see how much you save by choosing the efficient option. Fuel....
Gear Ratio Calculator – Final Drive & Speed
Gear Ratio Calculator Calculate the theoretical top speed in each gear at redline RPM — enter your gear ratios, final drive, and tire size. Gear....
HP to Torque Calculator – Power, Torque & RPM
HP to Torque Calculator Solve for horsepower, torque, or RPM — enter any two values and the third is calculated instantly. HP / Torque /....
Hybrid vs Gas Calculator – Is a Hybrid Worth It?
Hybrid vs Gas Calculator Find out how long a hybrid car’s higher price takes to pay back through fuel savings — and whether it’s worth....
Lug Nut Torque Guide – Pattern & Spec by Bolt Count
Lug Nut Torque Guide Get the correct lug nut tightening sequence and torque range for your wheel’s bolt count — essential for safe wheel installation.....
Power-to-Weight Ratio Calculator – HP per Ton
Power-to-Weight Ratio Calculator Calculate your car’s power-to-weight ratio in hp/tonne and kW/kg — the single best measure of raw performance. Power-to-Weight Calculator HP or kW....
Quarter Mile Calculator – ET & Trap Speed by HP
Quarter Mile Calculator Estimate your car’s quarter-mile elapsed time and trap speed from weight and horsepower using proven racing formulas. Quarter Mile ET Calculator Weight....
Road Trip Cost Calculator – Fuel Cost Per Person
Road Trip Cost Calculator Split a road trip’s fuel bill fairly — enter distance, economy, fuel price, and passenger count. Trip Cost Splitter Fuel cost....
RPM Calculator – Engine Speed at Any MPH
RPM Calculator Calculate engine RPM at any road speed from gear ratio, final drive, and tire size — essential for gearing decisions. RPM at Speed....
